Sofa



FIG. 1 is a perspective view of a sofa, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof taken from the right of FIG. 2;

FIG. 5 is a bottom view thereof;

FIG. 6 is a perspective view thereof showing the rear and the side opposite from that illustrated in FIG. 4; and,

FIG. 7 is a top view thereof. 

CLAIM I claim, the ornamental design for a sofa, as shown and described. 